[RE-wrenches] OK, so what iwould happen if I do this...

Tue Mar 3 22:53:31 EST 2020

Or a charger such as Iota, or power max. 

Jay
Peltz power. 

> On Mar 3, 2020, at 7:24 PM, don at energysolarnow.com wrote:
> 
> 
> You wrote that you would connect the Exeltech to just one of the service phases.
> But most GT inverters are 240 and require both phases. Is yours different? You did not mention which model it is. 
> Also, as Kent Osterberg mentioned, the Exeltech will not charge its batteries from the AC output.
> Your scheme with the PLC controlling an SCR leaves unaddressed how any charge current gets directed into the batteries to allegedly raise their voltage. Is there a charger somewhere in this scheme?
> You still need some way to charge batteries from solar. How about connecting a charge controller to some of the solar panels?
> 
> Don Barch
> Energy Solar
> -------- Original Message --------
> Subject: RE-wrenches Digest, Vol 13, Issue 59
> From: re-wrenches-request at lists.re-wrenches.org
> Date: Sun, March 01, 2020 2:19 pm
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> Today's Topics:
> 
> 1. OK, so what iwould happen if I do this... (Mark Frye)
> 2. Re: OK, so what iwould happen if I do this... (frenergy)
> 3. Re: OK, so what iwould happen if I do this... (Kent Osterberg)
> 4. Re: OK, so what iwould happen if I do this... (Jerry Shafer)
> 
> 
> ----------------------------------------------------------------------
> 
> Message: 1
> Date: Sat, 29 Feb 2020 15:27:32 -0800
> From: Mark Frye <markf at berkeleysolar.com>
> To: RE-wrenches <re-wrenches at lists.re-wrenches.org>
> Subject: [RE-wrenches] OK, so what iwould happen if I do this...
> Message-ID: <93731c38-40b5-7c63-1d74-a879fbdd9d74 at berkeleysolar.com>
> Content-Type: text/plain; charset=utf-8; format=flowed
> 
> I have 2kw of grid tied PV on my house.
> 
> Suppose I:
> 
> - Open the main breaker to disconnect from the grid
> 
> - I open the PV breaker
> 
> - I connect a small good quality inverter like an Exeltech XP 500 to one 
> of the phases of the service (120 VAC)
> 
> - I put a small battery pack, 100 AH at 24 VDC on the inverter
> 
> OK so far, I could run some small loads for a relatively short period of 
> time before the batteries get low
> 
> -I have a PLC with an AD input and DA output. On the input I measure the 
> battery voltage, on the output I control a SCR. The SCR controls a 2kw 
> immersion heater sitting in a big bucket of water. The PLC has a scan 
> time of 2 mS and I program it to increase the duty cycle of the SCR as 
> voltage of the battery rises above 24 VDC.
> 
> OK so far nothing has really changed from above.
> 
> - I close the PV breaker, the GT inverters see the battery inverter, 
> sync and connect after five minutes.
> 
> Voila, I can run house loads from 0 to 2kw with my existing GT PV with 
> the balance of energy dumped as needed to the immersion heater.
> 
> Right?
> 
> Mark Frye
> 
> 
> 
> ------------------------------
> 
> Message: 2
> Date: Sun, 1 Mar 2020 06:26:27 -0800
> From: frenergy <frenergy at psln.com>
> To: re-wrenches at lists.re-wrenches.org
> Subject: Re: [RE-wrenches] OK, so what iwould happen if I do this...
> Message-ID: <c97234cd-4441-34d7-740c-51f07837b081 at psln.com>
> Content-Type: text/plain; charset=utf-8; format=flowed
> 
> Mark,
> 
> ??? ??? ??? OR, you change-out your inverter to an SMA with Secure 
> Power Supply and during grid power outage, while there is some sun on 
> the panels, you would have up to 2KW of 120VAC power on the SPS circuit 
> by just flipping a switch. We usually install a 4X outdoor box with a 
> 120 VAC outlet ganged with a switch right under the inverter and let the 
> customer run the power to the : frig, lights, battery charger, TV or 
> whatever during an outage, though some romex could be run to close to 
> the frig.
> 
> Bill
> 
> Feather River Solar Electric
> Bill Battagin, Owner
> 4291 Nelson St.
> Taylorsville, CA 95983
> 530.284.7849
> CA Lic 874049
> www.frenergy.net
> 
> On 2/29/2020 3:27 PM, Mark Frye wrote:
> > I have 2kw of grid tied PV on my house.
> >
> > Suppose I:
> >
> > - Open the main breaker to disconnect from the grid
> >
> > - I open the PV breaker
> >
> > - I connect a small good quality inverter like an Exeltech XP 500 to 
> > one of the phases of the service (120 VAC)
> >
> > - I put a small battery pack, 100 AH at 24 VDC on the inverter
> >
> > OK so far, I could run some small loads for a relatively short period 
> > of time before the batteries get low
> >
> > -I have a PLC with an AD input and DA output. On the input I measure 
> > the battery voltage, on the output I control a SCR. The SCR controls a 
> > 2kw immersion heater sitting in a big bucket of water. The PLC has a 
> > scan time of 2 mS and I program it to increase the duty cycle of the 
> > SCR as voltage of the battery rises above 24 VDC.
> >
> > OK so far nothing has really changed from above.
> >
> > - I close the PV breaker, the GT inverters see the battery inverter, 
> > sync and connect after five minutes.
> >
> > Voila, I can run house loads from 0 to 2kw with my existing GT PV with 
> > the balance of energy dumped as needed to the immersion heater.
> >
> > Right?
> >
> > Mark Frye
> >
> > _______________________________________________
> > List sponsored by Redwood Alliance
> >
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> ------------------------------
> 
> Message: 3
> Date: Sun, 1 Mar 2020 08:58:45 -0800
> From: Kent Osterberg <kent at coveoregon.com>
> To: re-wrenches at lists.re-wrenches.org
> Subject: Re: [RE-wrenches] OK, so what iwould happen if I do this...
> Message-ID: <9e32901e-c5d4-ff70-9c44-406cc6d48d50 at coveoregon.com>
> Content-Type: text/plain; charset=utf-8; format=flowed
> 
> Mark,
> 
> I believe that your plan would fail because you are forcing power to 
> flow through the XP inverter backwards to charge the batteries. I don't 
> believe the XP inverter can do that. The grid tied inverter would 
> probably connect then immediately shut down, or connect and immediately 
> ruin the XP inverter. It would work if you had a inverter with a 
> bidirectional architecture like a Magnum, Outback, or Schneider 
> inverter. But even then you'd have a hazardous situation because the 
> cooling water is going to evaporate.
> 
> Kent Osterberg
> Blue Mountain Solar
> 
> 
> On 2/29/2020 3:27 PM, Mark Frye wrote:
> > I have 2kw of grid tied PV on my house.
> >
> > Suppose I:
> >
> > - Open the main breaker to disconnect from the grid
> >
> > - I open the PV breaker
> >
> > - I connect a small good quality inverter like an Exeltech XP 500 to 
> > one of the phases of the service (120 VAC)
> >
> > - I put a small battery pack, 100 AH at 24 VDC on the inverter
> >
> > OK so far, I could run some small loads for a relatively short period 
> > of time before the batteries get low
> >
> > -I have a PLC with an AD input and DA output. On the input I measure 
> > the battery voltage, on the output I control a SCR. The SCR controls a 
> > 2kw immersion heater sitting in a big bucket of water. The PLC has a 
> > scan time of 2 mS and I program it to increase the duty cycle of the 
> > SCR as voltage of the battery rises above 24 VDC.
> >
> > OK so far nothing has really changed from above.
> >
> > - I close the PV breaker, the GT inverters see the battery inverter, 
> > sync and connect after five minutes.
> >
> > Voila, I can run house loads from 0 to 2kw with my existing GT PV with 
> > the balance of energy dumped as needed to the immersion heater.
> >
> > Right?
> >
> > Mark Frye
> >
> > _______________________________________________
> > List sponsored by Redwood Alliance
> >
> > List Address: RE-wrenches at lists.re-wrenches.org
> >
> > Change listserver email address & settings:
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> 
> 
> 
> ------------------------------
> 
> Message: 4
> Date: Sun, 1 Mar 2020 07:31:36 -1000
> From: Jerry Shafer <jerrysgarage01 at gmail.com>
> To: RE-wrenches <re-wrenches at lists.re-wrenches.org>
> Subject: Re: [RE-wrenches] OK, so what iwould happen if I do this...
> Message-ID:
> <CAMUFgmVYBnMmzgE__tjDS9xpFsOU59jdf3wwSkFhjw291VGH0g at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
> 
> Mark
> What you are saying is to AC couple but most likely this would fail as your
> battery fills not enough loads HBCO or to much loads and your battery does
> a LBCO, either way you would be better off spending the money in a maybe a
> Outback Skybox easy install and is high voltage PV input and even a small
> 48 volt bank but think about storage
> Jerry
> 
> On Sat, Feb 29, 2020 at 1:27 PM Mark Frye <markf at berkeleysolar.com> wrote:
> 
> > I have 2kw of grid tied PV on my house.
> >
> > Suppose I:
> >
> > - Open the main breaker to disconnect from the grid
> >
> > - I open the PV breaker
> >
> > - I connect a small good quality inverter like an Exeltech XP 500 to one
> > of the phases of the service (120 VAC)
> >
> > - I put a small battery pack, 100 AH at 24 VDC on the inverter
> >
> > OK so far, I could run some small loads for a relatively short period of
> > time before the batteries get low
> >
> > -I have a PLC with an AD input and DA output. On the input I measure the
> > battery voltage, on the output I control a SCR. The SCR controls a 2kw
> > immersion heater sitting in a big bucket of water. The PLC has a scan
> > time of 2 mS and I program it to increase the duty cycle of the SCR as
> > voltage of the battery rises above 24 VDC.
> >
> > OK so far nothing has really changed from above.
> >
> > - I close the PV breaker, the GT inverters see the battery inverter,
> > sync and connect after five minutes.
> >
> > Voila, I can run house loads from 0 to 2kw with my existing GT PV with
> > the balance of energy dumped as needed to the immersion heater.
> >
> > Right?
> >
> > Mark Frye
> >
> > _______________________________________________
> > List sponsored by Redwood Alliance
> >
> > List Address: RE-wrenches at lists.re-wrenches.org
> >
> > Change listserver email address & settings:
> > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
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